Maybe simplifying the question will help.
When I do a "sh ip cef exact-route <src1> <dest1>" on the 3750, it shows me
that traffic should flow over link A. However, in actuality, it flows over
link B. When I do a "sh ip cef exact-route <src1> <dest2>" it shows me that
traffic should flow over link B. However, it actually flows over link A.
When I use a different <src> address but the same <dest> addresses, the "sh
ip cef exact-route" command gives me accurate results.
I don't have any policy routing enabled. I'm trying to figure out why
sometimes the "sh ip cef exact-route" command would produce accurate output
and why sometimes it wouldn't.
Stumped.
(p.s. thanks for the off-list reply I received)
----- Original Message -----
From: "Adam Greene" <[email protected]>
To: <[email protected]>
Sent: Tuesday, December 30, 2008 2:14 PM
Subject: [c-nsp] ip cef / ospf redundancy testing
Maybe someone could point me in the right direction ...
I'm doing some redundancy testing in the lab ...
I basically have two 3750's linked together redundantly via OSPF. IP CEF
is enabled. Both switches are running 12.2(25)SEE2. Switch B is receiving
redundant default routes from switch A.
According to "sh ip cef exact-route" issued on switch B, traffic from
<src1B> to <dest1A> and from <src2B> to <dest2A> should be all be
travelling over a single link, leaving the other one empty of traffic.
However, what I am actually seeing is that traffic from <src1B> to
<dest1A> is flowing over one link, and from <src2B> to <dest2A> is
travelling over the other.
"sh ip cef detail" confirms that per-destination load balancing should be
occurring, and when I run a single stream of traffic, indeed round-robin
per-packet load-sharing is not occurring.
Why would the traffic be following a different path than what the "sh ip
cef exact-route" command suggests it should?
Maybe I need to provide more detail for anyone to be able to opine ...
Thanks,
adam
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